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ADS1259: -2.5 < AINP - AINN < 2.5 输出代码始终在0~7FFFFF区间变化

Part Number: ADS1259

使用的是内部参考电压(2.5V),按照手册所描述:当 0 <AINP - AINN ≤ Vref 时,输出代码 < 0x7fffff,但是实际测试,AINP - AINN = 2V时,输出代码为:0x335D4D; AINP - AINN = -2V时,输出代码为:0x4c9c56;

-2.5 < AINP - AINN < 2.5  输出代码始终在0~7FFFFF区间变化;

请问大神们,这个问题如何解决,谢谢!